Changelog

0.2.0 (current)

Beam-centre detection — complete refactor

Unique centre-detection method: iso-intensity contour fitting (recalibrate_from_isocurve()). All previous methods (iterative ring moment, recalibrate_with_beamstop) have been removed.
Centre detected automatically at SAEDProcessor.__init__ — no manual initial_center needed. Result stored in proc.center as a plain (cx, cy) tuple.
proc.center can be read and overwritten freely before calling integrate() or extract_epdf().
Removed attributes: initial_center, skip_center_recalibration, use_ring_fit, use_isocurve.
Graceful fallback to intensity-maximum pixel if isocurve detection fails (e.g. unusual image geometry or very strong beamstop), with a printed warning.

MTF deconvolution

Richardson-Lucy filter removed; Wiener filter is now the only deconvolution method.
Wiener epsilon is read from column 3 of the MTF file when wiener_epsilon=None (default).

Streamlit app — Tab 1 redesign

New two-step flow per column (Sample / Reference):
1. Upload files (image, PONI, mask, MTF) — mask can also be drawn interactively via the pyFAI-drawmask GUI.
2. Click 🚀 Create SAEDProcessor — processor is created, isocurve runs, centre auto-filled in the Center X / Y fields.
Wiener ε field pre-filled from column 3 of the MTF file on upload.
🔄 Update button applies edited centre coordinates to the processor.
At PDF calculation time (Tab 2), centre is synchronised from the number-input fields before integrate() — the displayed value is always the one used.
Removed: global “Validate and Create Processors” button, dropdown for recalibration method selection, duplicated MTF parameter section below the columns.

NaN handling in compute_ePDF

Masked azimuthal-integration bins (NaN / zero-weight) are interpolated over before PDF computation, preventing crashes in PDFgetX3.